Ariston STI 125 INDIRECT Manual de instrucciones de instalación y uso - Página 21
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5.
FAULT FINDING
FAULT
NO HOT WATER
FLOW
REDUCED FLOW
RATE
WATER FROM
HOT TAPS
IS COLD
DISCHARGE FROM
PRESSURE/
TEMPERATURE
RELIEF VALVE
DISCHARGE FROM
EXPANSION
VALVE
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POSSIBLE CAUSES
1) Mains cold water
supply shut off
2) Line strainer
blocked
3) Cold Water
Combination valve
fitted incorrectly
1) Low mains water
pressure
2) Line strainer
partially blocked
3) Size of service
pipe too small
1) Direct immersion
heater is not
switched on
2) Direct thermal
cut-out has
operated
3) Boiler programmer
set to central
heating only
(Indirect models)
4) Boiler is not
functioning
(Indirect models)
5) Indirect thermal
cut-out has
operated
6) Motorised valve
jammed or not
wired correctly
(Indirect models)
1) Pressure above 7
bar, failure of
pressure reducing
valve. Temperature
above 90 C failure
of thermal control
1) Continually.
Pressure reducing
valve faulty
2) When heater is heating.
Faulty expansion
vessel or lost charge
REMEDY
Check and open Isolating
and/or stop valve. Check
water, Local Water Authority
Turn off mains water supply,
remove line strainer and
clean
Check direction of flow
arrows on valve, refit in
correct position if necessary
Check pressure, consult
Local Water Authority if
necessary
Turn off mains water supply,
remove line strainer and
clean
Increase to size stated on
page 6
Check immersion heater,
switch on if necessary
Test thermostat operation
and wiring, if faulty,
correct/replace. Reset cut-out
Check switch on domestic
hot water if necessary
Check boiler operation, if
fault suspected consult
manufacturer's instructions
Test thermostat operation
and wiring, if faulty,
correct/replace. Reset
cut-out
Check wiring and operation of
motorised valve correct/
replace as necessary
Shut down boiler or immersion
heater. Check pressure
reducing valve and thermal
controls. Replace if
necessary
Check pressure from valve.
Replace if over 3.5 bar
Check charge of vessel. Re-
charge vessel to 3.5 bar or
replace if necessary
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